See a dermatologist. Most em is erythema multiforme minor due to herpes. Every time you get a recurrence of a cold sore or other herpes you take a dose of Acyclovir pills or valacyclovir. This will prevent em. Erythema major can be serious , is most often an allergy to sulfonamide (smz/tmp) but may have numerous other causes. Treatment can be difficult , especially regarding the eyes.

Try these. Find british guidelines here: http://bestpractice.Bmj.Com/best-practice/monograph/367.Html. I'm not certain that their official guidelines. Not aware of american guidelines for treating this self-limited disease.

Erythema multiforme. It depends on the cause, and whether or not the cause is diagnosed and treated. If it's a drug side effect and the drug is stopped, it may start to clear up quickly, in a few days. If it's due to a chronic auto inflammatory condition, it could last a long time, or come and go with flares of the illness. http://www.ncbi.nlm.nih.gov/pubmedhealth/pmh0001854/.
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Erythema multiforme. It depends on the cause, and whether or not the cause is diagnosed and treated. If it's a drug side effect and the drug is stopped, it may start to clear up quickly, in a few days. If it's due to a chronic auto inflammatory condition, it could last a long time, or come and go with flares of the illness. http://www.ncbi.nlm.nih.gov/pubmedhealth/pmh0001854/.
Read more...